New math mapgen with fractal based worlds

src/CMakeLists.txt

@@ -233,6 +233,7 @@ set(common_SRCS
 	mapgen_v7.cpp
 	mapgen_indev.cpp
 	mapgen_singlenode.cpp
+	mapgen_math.cpp
 	treegen.cpp
 	dungeongen.cpp
 	cavegen.cpp